All Sections on M40M40. Stokenchurch to Waterstock (J5 to J8A)The road from Oxford to London has been an important highway for over 300 years. It was made a turnpike in 1718 and over the years the volume of traffic has continually increased. Improvements to the A40 east of Oxford were made in 1957 and 1964 when dual carriageways were built between the Oxford Ring Road and Waterstock Crossroads.

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M40. Waterstock (J8A) to Umberslade (M42 - J3A)The M40 up to Oxford was planned with its extension in mind. In the late 1960's, the Ministry of Transport carried out a feasibility study on a new route between Oxford and Birmingham while it was considering the development of a strategic motorway network for the country. It was to provide a direct link from the Midlands and North West to the South coast ports and an added route to London and the South East as an alternative to the M1. In 1972 it was added to the trunk road programme.